Difference between revisions of "83Plus:Software:usb8x/Asm Interface/MSD/UFI Read"
From WikiTI
m |
m (Forgot input (again)) |
||
| (One intermediate revision by the same user not shown) | |||
| Line 7: | Line 7: | ||
=== Inputs === | === Inputs === | ||
| + | * DE contains area to store sector | ||
* (MSDLBA) contains LBA address of sector to read | * (MSDLBA) contains LBA address of sector to read | ||
=== Outputs === | === Outputs === | ||
| − | |||
* C set if problems | * C set if problems | ||
Latest revision as of 16:58, 11 September 2006
Synopsis
Name: UFI_Read
Minimum usb8x version: 0.10
Reads one sector from (MSDLBA) address and stores in sector buffer.
Inputs
- DE contains area to store sector
- (MSDLBA) contains LBA address of sector to read
Outputs
- C set if problems
Destroys
- AF, BC, DE, HL
Notes
(MSDLBA) is a 4-byte area in the mass storage driver's internal memory buffer used by this routine. The following example code would set the value to zero, where appBackUpScreen is where the mass storage internal buffer is:
xor a ld (appBackUpScreen+MSDLBA),a ld (appBackUpScreen+MSDLBA+1),a ld (appBackUpScreen+MSDLBA+2),a ld (appBackUpScreen+MSDLBA+3),a
This is just to demonstrate where MSDLBA is in memory. See [[../MSD_Initialize|MSD_Initialize]] for more information about the internal buffer used by the mass storage driver.
See Also
- [[../MSD_Initialize|MSD_Initialize]] - Initializes the mass storage driver
